Starting-crank for explosive-engines.



1. s. BAKER. STARTING CRANK FOR EXPLOSIVE ENGINES.

APPLICATION FILED JUNE 80, 1910.

, Patented 1117,1911.

STATES A TfENT OFFICE.

JOHN s. BAKER, or EVANSVILLE, WISCONSIN.

STARTING-CRANK FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent.

Patented Feb. "4, 1911.

Application filed June 30, 1910. Serial No. 569,714.

To all may concern: Be it known that I, JOHN S. BAKER, a citizen of theUnited States, residing at Evans ville, in the county/of Rock and Stateof Wisconsm, have invented certain new and niac- 7 a simple andeffective mechanism for starting or cranking explosive engines, thatwill eliminate the danger to the: operator, in

starting the engine, when the engine kicks backward.

I This invention consists in a mechanism which. connects the handle ofthe starting crank with the engine-shaft, with sufiicient strength andositiveness for starting the engine, but which can be relied upon todisconnect the handle from the engine, when.

the engine kicks backward and exerts slightly more force in the hand ofthe oppartial section.

Referring particularly to Figs. 1, 2 and 3 of the drawings, the numeral1 designates the-crank provided at bneend'with the usual handle 2. Atthe other end of the crank,

I rovide a sleeve 3, having an opening sists of an arm 7 and a sleeve 8.At the lower end of the sleeve is provided the usual notches 9, forengagement with the pin 10 on the end of the engine-shaft 11. Trunnionedat 12 on the outer end of the arm 7 is a roller 13, which normallyengages a' notch .14 in the dog 15, which notchconforms to the peripheryof the roller. This dog is pivotedat 16, toan integral laterallyextending projection 17 on the crank 1 and said dogextends laterallyacross saidhandle audits 'frontend is rovided witha hook .18 forengagement wit 1 a hook 19. of a spiral spring flO. This spring isprovided w1th a second book 21, for engagement with the eye-bolt 22,which passes through the opening in a laterally projecting ear 23,preferably integral with'the crank 1. The .eye bolt is provided with anadjusting nut 24, bywhich the tension of the spring 20 may be varied,for. the obvious purpose of varying the force of'contact between the dog1 1 and the roller 13. At one side of the crank I provide a stop 25, tolimit theinward movement of the dog 15, when'the connection between thecoupling 6 and the crank is broken. The notch in the dog 15 is so shapedthat a greater amount of force will be required to break the rigidconnection between the crank and coupling, in turning the crank forwardin the cranking opera tion, than is required in readjustin or resettingthe parts after the connect1on has slightly deeper toward the free endof the dog than toward the ivoted end.

In the modification, *ig. 4, is shown a construction in which themechanism for normally establishing rigid connection bet-ween the crankand coupling is concealed behind the radiator, immediately in front ofthe en gine. Irrthis form, the construction of the mechanism forconnecting the crank and coupling is identical with that shown inthemain view. Referring now to Fig. 4;, I provide an arm 26 which, inthe main views, was continued to form the crank. This arm 26 is providedwith a trunnion 27 at its inner end, which enters the sleeve 8 and ispinned to said sleeve by means of a pin 28 which extends transversely ofthe sleeve,

a zid lies partly in a groove 29 in the trunnion be turnedindel'p'endently of each other, while said parts wil be prevented fromsliding .5 apart.

is the crank shaft30, which passes through a suitable bearing 31, in theradiator3l.

This shaft 30 is provided at its outer end -with the usual crank 32 andinterposed be-' .10 tween the front of the radiator and a collar 33carried by the crank-shaft, is the usual spring 34, for keeping thecrank normally out of engagement with the engine-shaft.

In the construction shown and described,

it will be noted that the crank and coupling 7 are held rigidly togetherunder the tension of the spring 20, and when the 'parts are in thisposition, the crank is operated in the usual way to start'the'engine,the coupling being of sufiicient strength for this purpose,

but should the. engine kick suddenly backward, exerting more force onthe hand of the operator than is required for starting,.such

excessive forc'ewouldbe sufficient to roll the roller out of the notchin the dog and thus disconnect the coupling from the crank, thuseliminating the danger of serious accident to t the operator.

It will be understood that the construction 80 of the mechanism shownmay be changed or varied within the scope of this invention.

For instance, the axis upon which the dog 15 turns, need not be parallelto the axis on which the, handle turns, or for instance, the

85 axis of the handle need not coincide withthe axis of the coupling.

Havingthus described m invention, what 1. A starting crank for engines,compris- 40 mg a member ada ted tovbe coupled to the engine-shaft,ancit-litr member pivoted there? to, a dog carried by one of themembers, a

rollercarried by the other, and means for holding said dog and roller inclose contact,

whereby rigidrelationship between the two members is effected,substantially as and for I the purpose set forth. a

2. A starting crank for engines, compris- "ing amember adapted to becoupled to the "engine-shaft, another member pivoted there-- to, aroller carried by carried by the other member,

acting upon said dog to keep the. same in close contact with the roller.to effect rigid relationship between the two members under normalconditions, substantially as and for the purpose set forth.-

and a spring 3. A startingcrankfor engines, compris Q inga memberadapted to be coupled to an engine-shaft, another member pivotedther'eto, a roller journaled upon one member, a dog pivoted to the othermember and adapted to engage theroller, a springacting'on so that thearm 26 and coupling 6 may' Preferably integral with the arm 26- theroller,

- 5. A starting crank for engines,

the two members is established under normal to, a roller. journaled'uponone of said memmembers and a one member, a dog thereto, a do season thedog 'to hold the'same in close contact with the'rc-zller, whereby rigidrelationship '65 between the two members is established, under normalconditions, and' means for varying the stress of the spring, substantially as described.

A. A starting crank for engines, comprising a member adapted tobe'coupled to an engine-shaft, another member pivoted thereto, a rollerjournaledupon one member, a dog. pivoted to the other member, and havinga notch therein adapted to be entered by and a spring acting upon thedog to hold the same in close. contact with the roller, whereby rigidrelationshi '--betweenthe two members is established un er normalconditions, substantially as described. v comprising a member adapted tobe coupled to, an engine-shaft, another member pivoted there to, aroller journaled to one of said members, a dog pivoted to the othermember and hav-ett; ing a notch therein adapted to be entered bytg theroller, said notch being so formed that a greater force will be requiredto break the rigid relationship between the members in turning the crankforward than 'is required to reset said members and reestablish saidrigid relationship, and a spring acting upon the do to hold the same inclose contact with the rol er, whereby rigid relationship betweenconditions, substantially as described; V

- 6. A-starting crank for engines, comprising a member adapted to becoupled to an engine-shaft, another member pivotedtheref bers and a dog'ivoted to the other of said dtpted. to engage the roller,

a spring acting on the dog to hold the same in close contact with theroller, whereby rigid; relationship. between the two members is.established undernormal conditions, and a suitable stop for limiting theinward movement of the dog when the rigid relationship of theltwomembers is broken. 4 p a 7. A starting crank for engines, ing amember'adapted to-be coupled engine-shaft, another member pivoted thereto, a roller journaled upon one of said ,mem-L bers, a dog pivoted tothelother member and adapted-to engage the roller, a spring-acting .1 5on said dog to hold the same. in closelcontact 1 with the roller,-whereby rigidrelationshipl' between "the two members is established{under normal conditions, and acrank-shaft 1 carried by one-of saidmembers, and provided withnasuitablecrank.

1.-8l A'st'arting-crank forengmes, comprisi ing a crank-arm "adapted tobe coupled-to thefengineshaft, a couplingar pivoted roller carrie by thecoupling-:arm,g and carried by .the' crank-arm, a

means for holding the do into engagement engagement with the roller,whereby the 10 with the roller, whereby t e crank and conpling-arms arenormally locked togethen 9. A starting-crank for explosive engines,

" comprising a crank-arm adapted to be coupled to the engineshaft, acoupling-arm pivoted thereto, a notched dog pivoted on the crank-arm, aroller carried by the couplingarm, and a spring for holding the dog intocoupling-arm is normally held into locked engagen'lent with thecrank-arm.

Intestimony whereof I affix my signature in presence of two witnesses.

JQHN S. BAKER. Witnesses THOMAS I)URAN'L, Tnmx W. JOHNSON.

